參數(shù)資料
型號(hào)： MC68HC11K1
廠商： Motorola, Inc.
元件分類： 8位微控制器
英文描述： 8-Bit Microcontroller(8位微控制器)
中文描述： 8位微控制器（8位微控制器）
文件頁(yè)數(shù)： 5/20頁(yè)
文件大小： 286K
代理商： MC68HC11K1
AN1242/D
MOTOROLA
5
Figure 3 Initial Single-Chip Mode Memory Map
Sophisticated control algorithms are required to support the increased functionality of the keyboard and
LCD panel. To speed code development, reduce the cost of support, and provide for future enhancements,
the firmware for the next generation product will be ported from M68HC11 assembly language to C. While
high-level languages simplify the development of complex control applications, they do so at the expense
of greater storage requirements. The reduction in object code size achieved by hand-tuning assembly lan-
guage programs begins to disappear as application functionality and complexity increase.
One possible method of providing for increased storage demands would be to use the flexible memory ex-
pansion capabilities of an M68HC11K device. This would lead to the simple expanded memory map shown
in
Figure 4
. Estimates indicate that the control algorithms will require 32 Kbytes of EPROM and that the
LCD data tables will require an additional 32 Kbytes. A 16 Kbyte memory paging window can be used to
access the LCD data and still provide 12 Kbytes of contiguous address space for any other memory mapped
peripherals that may be needed.
$0000
REGISTERS
AN1242 SCM MEM MAP
24 KBYTES EPROM
$007F
$0080
$037F
$0380
$0D7F
$0D80
$0FFF
$A000
$FFC0
$FFFF
SRAM, REGISTERS, EEPROM
VECTORS
768 BYTES SRAM
EXTERNAL ADDRESSES
640 BYTES EEPROM
$FFBF
$A000
$FFBF
$BFFF
$C000
ASCII TERMINAL DATA
PAGES AND CONSTANTS
CONTROL ALGORITHMS
EXTERNAL ADDRESSES
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MC68HC11K1CFNE3 功能描述:8位微控制器 -MCU 8B MCU 768 RAM - EPP RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
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